22. Population Demography and Human populations FALL 2007 skeleton

22. Population Demography and Human populations FALL 2007 skeleton

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1 How Does Age Affect Growth of Populations?
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2 How Does Age Affect Growth of Populations? The logistic model assumes: 1. Birth/death and density affect growth instantaneously 2. All individuals genetically the same 3. All individuals equal in terms of birth and death – age doesn’t matter
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3 But We Know This Isn’t Realistic Individuals have different probabilities of living, dying and reproducing …
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4 Age structure alters population growth Baby boomers babies Fig. 54.4
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5 Which country’s population is growing fastest?
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6 We can use life tables to summarize differences based on age Life tables summarize mortality and survival rates = static life table Or life tables follow a cohort of individuals and measure survival and fecundity = cohort life table
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7 Static Life Table Dall Mountain Sheep - Alaska
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8 Static life tables - show survivorship with age - 3 basic shapes Annual plant Fig. 54.3
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9 Other populations?
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10 Static life tables … Show survivorship and mortality But don’t tell us if population is increasing. decreasing or remaining the same We need to know something about reproduction Cohort life table follows individuals (usually females) through time …
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11 Cohort Life Table Annual Grass
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12 R o , the net reproductive rate, tells us … • If R o > 1, population is increasing • If R o = 1, population is steady • If R o < 1, population is decreasing R o is simply whether a female is replacing herself, or not
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13 How Do Species Vary in Survival and Reproduction?
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This note was uploaded on 04/02/2008 for the course SOC 101 taught by Professor Sullivan during the Spring '08 term at ASU.

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22. Population Demography and Human populations FALL 2007 skeleton

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